Red color-lake.



KARL 'KONIG, OF HooHsT-ou-THE-MMN, GERMANY, ASSIGNOR TO FARBWERKE, voRM.

MEISTER, LUCIUS & BRUNING, OF HOCHST-ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

Specification of Letters Patent.

RED COLOR-LAKE.

Patented Feb. 11 1908;

.. Application filed November 6. i906. Seria1Nol342|181| (Specimena) To all whom it may concern."

Be it known that I, KARL KONIIG, Ph. D.,

chemist, a citizen of the Empire ofGermany,

residing at Hchst-on-the-Main, Germany, have invented certain new and useful Improvements in the Manufacture of Color akes, of which the following is a specification. I

I have found that from the dyestuff, ob-

tained by combining diazotized ortho-aminobenzoicacid and beta-naphthol, color lakesv may be produced which are distinguished by their excellent covering power, remarkable fastness to light and absolute fastness to water and alcohol and very pure shade. The

barium lake especially exhibits strongly dichroistic properties. a This lake, when thickly applied, is of a bright orange-red of beautiful metallic luster; thinly applied, it is of a very pure blue-red shade. I I

The manufacture of the lake occurs in the usual manner, by treating, for instance, the aqueous suspension of the alkali salt of the dyestuff with solutions of metallic salts or by proceeding according to the process described in English Patent No. 27252 of 1905.

' Example: 100 kilos of a paste of 20 per cent. strength of the sodium salt of the dyestufi' are well suspended water, where- .upon a solution of 20 kilos of barium chloridis added. Thewhole is heated to boiling and this temperature is maintained for a short time. The lake is finished in the usual mialnner. A substratum .may be addedat W I Having now described my invention, what I claim is I As products, the color lakes derived from the azo-dystuff obtained by combining orthoaminobenzoic acid with beta-naphthol, being of 'a brilliant red pure tint, remarkable covering power when applied with oil, insoluble inwater and alcohol and fast tolight and lime.

In testirnony, that I claim the foregoing as my mvent1 on,l have signed my name in presence of two subscribing witnesses.

Witnessesz JEAN GRUND, I OARLGRUND.

'KARL KoNIc.. 

